How to Convert String to Number in Javascript

Question

I have this line of code:

($(".contact-msg-inpt").prop("scrollHeight"))

and I'm trying to figure out how can I add a number, say 5 or 8, or 10 or whatever to this value, but in one line?

I tried this one, but it didn't work:

parseInt("(($(".contact-msg-inpt").prop("scrollHeight"))", 10)

Number($(".contact-msg-inpt").prop("scrollHeight")) + X – Daniel Jul 26 '17 at 15:21 — Daniel, Jul 26 '17 at 15:21
Thank you all! Very, very much! – iloveprjaniki Jul 26 '17 at 15:40 — iloveprjaniki, Jul 26 '17 at 15:40

score 2 · Accepted Answer · answered Jul 26 '17 at 15:21

2

Simply by doing :

var result = parseInt($(".contact-msg-inpt").prop("scrollHeight"))+10;

You have to parse the value first then add the number to it.

answered Jul 26 '17 at 15:21

Sletheren

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Thanks a lot, Sletheren! – iloveprjaniki Jul 26 '17 at 15:40
Glad I could help :) – Sletheren Jul 26 '17 at 16:51

score 0 · Answer 2 · answered Jul 26 '17 at 15:24

It doesn't work because you are literally trying to parse the string ($(".contact-msg-inpt").prop("scrollHeight")) as an int. And furthermore this string is incorrect because of the quotes inside.

Loose the quotes at the beginning and end. The extra parantheses are not needed as well.

parseInt($(".contact-msg-inpt").prop("scrollHeight"), 10)

score 0 · Answer 3 · answered Jul 26 '17 at 15:28

0

scrollHeight is a readonly property, you can't change it, change the element height / padding / using css or styles.

see this answer here: https://stackoverflow.com/a/22675563/1243058

answered Jul 26 '17 at 15:28

8DX

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How to Convert String to Number in Javascript

3 Answers3